MONOGRAPH OF THE ATLANTIDAE. 



5 



(0,5 — 3 mm.), chalky part, either wholly or on the penul- 

 timate whorl, provided with conspicuous undulating spiral 

 lines ; median plate of radula with three spines, all of 

 nearly the same length . . . Oxygyrus rangi (Souleyet). 



Species 1. Oxygyrus keraudreni (Lesueur). 



1817. Atlanta keraudreni Lesueur. 



1835. Oxygyrus in flatus? Benson. 



1830. Atlanta (Helicophlegma) keraudreni d'Orbigny. 



1840. ,, bivonae Pirajuo. 



1841. Ladas keraudreni Cantraine. 

 1850. Oxygyrus keraudreni Gray. 

 1852. Atlanta violacea? Gould. 

 1852. ,, tessellata? Gould. 

 1852. ,, mediterranean Costa, 



non Quoy et Gaimard (1832), Souleyet (1852) >), 

 Ray Lankester (1883) and Pelseneer (1906). 



Animals : 



Mediterranean, date? ± 20 sp., Cantraine. 



Atlantic Ocean, (0" N., 23" W.), 1879, 1 sp., Kruisinga. 



// (1° S., 23" W.), 1879, 4 sp., // 



Species 2. Oxygyrus rangi (Souleyet). 



1852. Atlanta rangi Souleyet. 

 1862. Oxygyrus n. sp. Macdonald. 

 1888. Oxygyrus rangi Smith. 



Animals : 



Mediterranean, date? 3 sp., Buitendijk. 



Indian Ocean 2 ), January '06, 1 sp., // 



'/ April '06, 5 sp., // 



1) Souleyet (Voy. Bonite) and after him Ray Lankester (Enc. brit.) and 

 Pelsencer (Treatise of Zoology, p 161) erroneously refer a figure of A. peroni 

 to O. keraudreni. 



2) It may be stated here, that with the term ,, Indian Ocean" in this paper 

 always the same route: Perim — Point de Galle — Sabang is meant. 



Notes from the Leyden Museum, "Vol. XXX. 



